package com.hjk.common.utils.web;

import com.hjk.common.utils.check.Check;
import com.hjk.common.utils.string.JsonUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;
import java.io.InputStream;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Map;

/**
 * IP地址

 * @Date 2019年01月14日
 */
public class IPUtils {
	private static Logger logger = LoggerFactory.getLogger(IPUtils.class);
    private static String unknown ="unknown";
	/**
	 * 获取IP地址
	 *
	 * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
	 * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
	 */
	public static String getIpAddr(HttpServletRequest request) {
    	String ip = null;
        try {
            ip = request.getHeader("x-forwarded-for");
            if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
            }
            if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
            }
            if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_CLIENT_IP");
            }
            if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            }
            if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
            }
        } catch (Exception e) {
        	logger.error("IPUtils ERROR ", e);
        }

        //使用代理，则获取第一个IP地址
        if(StringUtils.isEmpty(ip) && ip.length() > 15) {
			if(ip.indexOf(",") > 0) {
				ip = ip.substring(0, ip.indexOf(","));
			}
		}

        return ip;
    }

    /**
     * Gets city by ip addr.
     *
     * @param ipAddr the ip addr
     *
     * @return the city by ip addr
     */
    public static Map<String,Object> getCityByIpAddr(String ipAddr) {
        // http://lbs.amap.com/api/webservice/guide/api/ipconfig/
        logger.info("根据IP定位. ipAddr={}", ipAddr);

        String urlAddressIp = "http://restapi.amap.com/v3/ip?key=f8bdce6f882a98635bb0b7b897331327&ip=%s";
        String url = String.format(urlAddressIp, ipAddr);
        Map<String,Object> location = null;
        try {
            URL u = new URL(url);
            InputStream stream = u.openStream();
           String str = IOUtils.toString(stream, StandardCharsets.UTF_8);
            if (Check.isNotEmpty(str)) {
                location = JsonUtils.toMap(str, String.class, Object.class);
            }
        } catch (Exception e) {
            logger.error("getCityByIpAddr={}", e.getMessage(), e);
        }
        logger.info("getCityByIpAddr - 根据IP定位. ipAddr={}, location={}", ipAddr, location);
        return location;
    }

    public static void main(String[] args) {
        getCityByIpAddr("10.2.24.24").forEach((k,v)-> System.out.println(String.format("%s=%s",k,v)));
    }


}
